球磨机新型控制策略研究与应用

Control strategy for ball mills

球磨机制粉系统是电厂除锅炉燃烧系统外的又一重要调节系统。该系统具有多变量强耦合、非线性严重以及生产工况变化大等特性,采用常规控制策略很难奏效。在对球磨机动态特性分析的基础上,提出了一种新型控制策略。该控制策略采用软测量技术获取磨负荷信息,通过协调器实现对球磨机的磨负荷和出口温度的有效控制。通过控制热、冷风量的比值实现对球磨机入口负压的控制。控制器均采用模糊PID控制算法,以确保动态响应和稳态精度。实际运行效果表明,该控制策略具有简单、可靠、实用等特点。

Ball mills are strongly coupled,multivariable and nonlinear system with violently variable operating conditions. Usual control strategies are ineffective. A new strategy is put forward based on analyzing the dynamic characteristics of ball mills. It uses soft sensor to get the information of mill load and uses coordinator to effectively control mill load and output temperature. It controls the inlet negative minus pressure via the quantity ratio of hot and cold winds. In order to ensure the dynamic response and static accuracy,fuzzy PID controllers are applied. The actual application expresses that the proposed control strategy is simple,reliable and practical.